Contribution information

Title Lactic acid separation by the liquid membrane at high pH.
Status Accepted
Final type Poster
Final session Momentum, heat and mass transfer
Authors T., Kracík1, T., Moucha2
1 UCT Prague, Prague, Czechia
2 UCT Prague, Prague, Czechia
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Brief content At the moment the black liquor from kraft pulping process is treated in the recovery cycle to recover process chemicals NaOH and Na2S, where lignin is used as fuel. Lignin isolation and purification are target of research worldwide, besides lignin carboxylic acids are present in the black liquor. The separation of these acids may transit into a biobased economy and generates an added value in the pulping process. One method for the isolation of carboxylic acids is liquid-liquid extraction. Reactive extraction enhances extractability of carboxylic acids, however, when extraction is applied to highly alkaline solutions, such as the black liquor, commonly used extractants are not suitable. Therefore, new extractants (such as deep eutectic solvents or ionic liquids) have been developed in the last couple of years. The extraction of organic acids from aqueous solutions at high pH value hasn´t been targeted in the studies sufficient. Membrane based processes are emerging in the biobased industry, liquid membrane permeation combines an extraction with a membrane process. The membrane processes offer a way how to remove organic acids from aqueous solutions while performing the back extraction simultaneously. The membrane based separation is able to reach high flux and selectivity. This work investigated the applicability of supported liquid membrane for lactic acid separation from highly alkaline process streams. The results indicate that the extraction of lactic acid from highly alkaline aqueous solution is possible by using supported liquid membrane but need to be further improved.
ID 48